One grizzly bear's incredible 5,000-mile journey across Montana and Idaho has scientists re-thinking what they know about the animals.
Ethyl the grizzly bear walked from Kalispell, Mont. west toward Coeur d’Alene and back east toward Missoula. She covered thousands of miles of mountainous terrain in just two years, and scientists are still trying to figure out why.
U.S. Fish and Wildlife Service grizzly bear recovery coordinator Chris Servheen says Ethyl's story began when she was first captured in 2006 east of Kalispell, Mont.